1. Determine whether a precipitate will form when 100.0 mL of 4.0x10^-3 M BaCl2

Question

1. Determine whether a precipitate will form when 100.0 mL of 4.0x10^-3 M BaCl2 and 300.0 mL of 6.0x10^-4 M Na2SO4 are mixed.
(8 pts.) 13. Determine whether a precipitate will form when 10o.o mL of 4.0 x 10 3 M Bacl and 300.0 mL of 6.0 x 10 4 M Na2SO4 are mixed. (6 pts.) 14. Ammonia gas is dissolved in a 1.00 x 10 4 M solution of Cuso4, so that initially INH3] 2.00 x 10-3 M. Calculate the concentration of Cu2' ions in the solution after the reaction mixture has reached equilibrium. The formation constant for Cu (NH3)4 5.0 x 1013

Explanation / Answer

Q13.

precipitate forms is Q > Ksp

identify the precipitate:

Ba+2 and SO4-2 will form BaSO4 (s)

so

BaSO34(s)<--> Ba2+ + SO4-2

Ksp = [Ba+2][SO4-2]

Ksp value for BaSO4 = BaSO4 1.08×10–10

[Ba+2] = M1*v1/(V1+V2) = 100*(4*10^-3)/(100+300) = 0.001

[SO4-2] = M2*V2/(V1+V2) = 300*(6*10^-4)/(300+100) = 0.00045

Q = (0.001)*(0.00045) = 4.5*10^-7

Q > Ksp

Since Q >> Ksp, then expect precipitate to form

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